The
River Twiss is a river in the county of
Yorkshire, England. The source of the river is Kingsdale Beck which rises at
Kingsdale Head at the confluence of Back Gill and Long Gill in the
Yorkshire Dales. Beneath Keld Head, it changes its name to the River Twiss. It has two notable waterfalls,
Thornton Force and Pecca Falls, and its course follows part of the Ingleton Waterfalls Walk, then through Swilla Glen to Thornton in Lonsdale and down to
Ingleton, where it meets the
River Doe to form the
River Greta.